Hi Jim,
I'm surprised that plastic bags would hold up in the machine at all - one of the tests people do to get a feeling for the strength of the machine is to submerge a piece of aluminum foil and run the machine - the foil is usually perforated by the cavitation action. Generally speaking there will be some reduction in the US action, but jars are pretty much the standard way of doing this in a tank style machine.
Not knowing the specifics of your machine, I can only suggest you try it and see how the jars work.
Cheers, Al
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